Monoazo dyes and process of making same



Patented Jul- 7, was.

UNITED STATES PATENT OFFICE;

AUGUST LEOPOLD LASKA AND ARTHUR zrrsorinn, or orrnnnaomon 'rnn-lvrmn,

GERMANY, ASSIGNORS T CORPORATION or GHEMISCHE FABRIK GRIESHEIM- ELEKTRON, or rmnxronr-on-rnrruam, GERMANY.

MbNOAZO DYES AND PROCESS OF MAKING SAME.

No Drawing.

To all'whom it may con-061%."

Be it known that we, AUGUST LEOIOLD LASKA and ARTHUR Zrrson'nn, citizens of the German Republic, and residents of Oifenb bach-on-the-Main, have invented certain new and useful Improvements in Monoazo Dyes and Processes of Making Same, and we do hereby declare the following to be a full,

' in light colors as a pink of an excellent beauty and fastness.

The invention 1s illustrated by the following examples:

Emample 1. v

Into a diaz o solution, prepared in the usual manner from 1512parts of 5-nitroortho toluidin (CH NH NO,:1: 2:5) 30.7 parts of para-anisidid of 2.3-hydroxynaphthoic acid are while well stirring slow y poured, dissolved in diluted caustic soda solution, prepared from 29.2 parts of solution of B. and to which is added turkey 35 corresponding to the surplus of acid in the diazo solution. p

The dyestuff separates in redfiakes', it is filtered, when the reaction 'is completed, washed until neutral reactionand advantageously. used in the form of a paste.

- When dry'it forms a red powder,-dissolving in concentrated sulfuric acid to a dark bluish red solution.

cording to one of the usual methods, is distinguished by-an excellent :Ea'stness to *light.

the

fiber. The yarn, which is well boiled with soda or caustic soda is impregnated with a warm 1 solution of para-anisidid of 2.3-hydroxynaphthoic acid, well wrung out andthen added.

red oil and a quantity of sodium acetate.

The color lake, prepared therefrom 5e Application filed September '11, 1022. Serial No. 587,571. I

without drying developed in a diazo solution of 5-nitro ortho-toluidin.

Padding solution. Para-anisidid of the 2.3-hydroxynaphthoic acid, for p'inlg 2 gr for red, 40 gr.; caustic soda solution of 34 B., forpink, 5 cc.; for red, 100-cc.; turkey'red oil, for pink, 50 cc.; for red, 120 cc.; formaldehyde of 30 p. c., for pink, 2 cc.; for red, 45 cc.; made up to, for pink, 10 liters; for red, 10 liters. The para anisidid of2.3-hydroxynaphthoic acid is'stirre'd with the caustic soda solution and the turkey red oil, then dissolved in boiling water, made up with cold water to the mentioned quantity and to the warm solution of about 30 C.'the formaldehydeis Dz'aaosolutz'on. i

300 gr. of 5-nitro-orthotoluidin are dissolved in 600 cc. of hydrochloric acid of 20 B.'and 1000 cc. of water by boiling. Then while stirring continuously 1000 gr. ofice and 2000 cc. of cold water are added,'wh ereon the base is separating.

Into this suspension a solution of 150 gr. I

of sodium nitrite in 300 cc. of water is slow .ly poured and made up, after the diaz otiz'a tion is completed, to 10 liters' Dye baths of. the diazo solution above mentioned, for pink, cc.;for red, 1 liter,

are mixed with, for pink, 1 liters; for'red, 9 liters, of cold water and there is added to before dyeing, for pink, 10, cc.; for red, 160 'cc.,of a solution of sodium acetate (1:1).

The padded yarns are handled for a short time in the dyeing baths, wrung out, well rinsed with cold water and soaped, when boiling:

so clear'bluish pink or red shades of an excellent brightness. and fastness to light are obtained.

The formula of the dye is probably omoOemz-o e I which when dry is a red powder, insoluble in water and soluble in sulphuric acid to a bluish red solutionpof an excellent fastness to light, and when produced on the fibre having fast bluish-red shades; yielding on reduction with. stannous chlorides 2.5-diamino-toluene and para-methoxyl-anilid of 1 amino-2 hydroxy-3-naphthoic acid. 1

With other para-alkyloxyarylids,for ex ample w1th"para-phenetidid 0f.2.3-hydroxynaphthoic acid, the'process can be carried out in the same manner, giving dyes of probably the general formula and are, when dry, red powders, insoluble in water and soluble in sulphuric acid, yielding lakes fast to light and when produced on the'fibre, fast bluish-red shades, yielding on reduction with stannous chloride 2.5 di-amino-toluene and a para-alkyl-oxy-amid of 1-amin'o-2 hydroxy-3-naphthoic acid,

We claim:

1. As new products the monoazo dyes, which areobtained by combining the diazo compound of 5-nitro-ortho-toluidin (CH NH NO 1 2: 5) with a'para-alkyloxyarylid of 2.3-hydroxynaphthoic acid, having probably the general formula:

HNOO

which are, when dry, red powders, insoluble in water and soluble in sulfuric acid to a bluish red solution, yielding lakes of an excellent fastness to light and, when produced on the fiber, exce ently beautiful and fast bluish-red shades, yielding on reduction with stannous chloride 2L5-di'amino toluene and a para; lkyloxyanilid of 1- amino-2-hydroxy-3-naphthoic acid.

2. A process of making monoazo dyes,

consisting in combining the diazo compound.

of 5-nitro-ortho-toluidin CH NH N0 1 2 5) with a para-alkyloxyarylid of 2.3-

hydroxynaphthoic acid.

3; A process for producingmonoazo dyes on the fiber, consisting in impregnating the i fiber with a para-alkyloxyarylid of 2.3-hy- I droxynaphthoic acid and developing with the diazo compound of 5-nitro-ortho-toluidin (CH :NH :NO :1:2:5). I

4.-As a new. product the monoazo dyestufl'f, which is obtained by combining the diazo compound of. 5-nitro-ort o-toluidin (CH, NH N02221: 2 :5) with ara-anisidid-of 2.3-hydroxynaphthoic acid,.having' probably the formula:

' CH: I i

which is whendry a red powder, insoluble in water. and soluble in sulfuric acid to a yielding lakes of an bluish red solution,

excellent fastness to ight and, when produced on the fiber excellentlybeautiful and fast bluish red shades, yielding on reduc tion with stannouschloride 2.5-diaminotols uene and para-methoXy-anilid of l-amino- 2-hydroxy-3-naphthoic acid;

5. A process of makin a monoazo dyestulf, consisting in com ining the diazo compound of 5-nitro-ortho-toluidin (0H,:

NH :-NO =1:2:5) with p-anisidid of 2.3-

hydroxynaphthoic acid.

6. A process for producing-a monoazo dyestufi onthe fiber, consisting in impreg-' nating'the fiber with p-anisidid of 2.3-hydroxynaphthoic acid and developing with the diazo compound of 5-nitro-ortho-tolui" 

